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Catalyst for purifying exhaust of petrol engine using ethyl hydrate as fuel and preparation method thereof

A technology for tail gas purification and ethanol fuel, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of high temperature deactivation of transition metal catalysts, and achieve improved thermal stability and low temperature activity, High removal efficiency, promoting improved effect

Inactive Publication Date: 2009-07-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the catalysts used to purify ethanol in tail gas use noble metals Pt, Pd, Ag and some non-noble metals (Cu, Mn) as active components; compared with noble metals, transition metal catalysts are cheap and easy to obtain; and in ethanol, acetaldehyde In the oxidation process of organic matter, transition metals show better activity; but transition metal catalysts also have high temperature deactivation problems

Method used

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  • Catalyst for purifying exhaust of petrol engine using ethyl hydrate as fuel and preparation method thereof
  • Catalyst for purifying exhaust of petrol engine using ethyl hydrate as fuel and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] Weigh Ce(NO 3 ) 3 6H 2 O 27.342g, ZrO(NO 3 ) 2 6H 2 O 8.667g, Mn(NO 3 ) 2 3.579g was made into 200ml solution, 50.4336g of citric acid was weighed to make 1548ml solution, after mixing evenly, 30ml of ethylene glycol was added, stirred at room temperature for 30min, heated in 80°C water bath for 12h, wet gel was dried at 100°C for 8 hours, milled, Calcined at 500°C for 5 hours to obtain CeO 2 —ZrO 2 - MnOx catalyst.

[0027] The catalyst is used to test the catalytic activity of simulated ethanol gasoline vehicle exhaust: a fixed-bed reactor is used, and 0.25 g of the catalyst is installed in a quartz tube reactor with a diameter of 12 mm. Air brings ethanol into the reaction system with a space velocity of 30000h -1 , using temperature programming (10°C / min), using infrared detection of CO in the product 2 concentration. Catalytic evaluation results such as figure 2 shown.

Embodiment 2

[0029] Weigh Ce(Ac) 3 5H 2 O 11.6312g, Zr(Ac) 4 4.4748g, Fe(Ac) 3 4.04g to make 200ml solution, weigh 65.016g citric acid to make 1548ml solution, mix well, add 30ml ethylene glycol, stir at room temperature for 30min, heat in 80℃ water bath for 12h, dry the wet gel at 100℃ for 8 hours, grind, Calcined at 500°C for 5 hours to obtain CeO 2 —ZrO 2 - FeOx catalyst. Catalytic evaluation results such as figure 2 shown.

Embodiment 3

[0031] Weigh Ce(NO 3 ) 3 6H 2 O 27.342g, ZrO(NO 3 ) 2 6H 2 O 8.667g, Co(NO 3 ) 2 2.91g made into 200ml solution; adding concentration is 2M NH 3 ·H 2 0, the final pH value was controlled at 10, and the stirring was continued for 30 min. Under continuous stirring, add ethylene glycol, ethylene glycol: mixed solution = 1:20, stir for 3h; then heat in a constant temperature water bath at 70-80°C for 12h, filter with suction, dry at 100°C for 8 hours, grind at 500°C Roasted for 5 hours to obtain CeO 2 —ZrO 2 - CoOx catalyst. Catalytic evaluation results such as figure 2 shown.

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Abstract

The invention relates to an exhaust catalyst of gasoline engines using ethanol fuel and a preparation method thereof. The catalyst is composed of 50%-70% CeO2, 20%-30% ZrO2 and 1%-20% transition metal. Sol-gel method or coprecipitation method is used to prepare the transition metal (Mn, Fe, Co, Ni or Cu) doped Ceria / Zirconia solid solution catalyst. The exhaust catalyst prepares the solid solution by adding the transition metal in the Ce-based materials, which greatly improves the heat stability and low-temperature activity of the Ce-based materials and increases the catalytic performance. The exhaust catalyst of the invention is used for cleaning the exhaust of the gasoline engines using ethanol fuel, has high removal efficiency, and also has the advantages of simple preparation, low cost and high activity.

Description

technical field [0001] The invention relates to an ethanol fuel gasoline engine tail gas purification technology, in particular to an ethanol fuel gasoline engine tail gas purification catalyst and a preparation method thereof, in particular to a cerium-based oxide composite transition metal catalyst for ethanol fuel gasoline engine tail gas purification and a preparation method thereof. The transition metal is added to the cerium-based material to form a solid solution, which improves the thermal stability and low-temperature activity of the cerium-based material, and promotes the improvement of catalytic performance. Background technique [0002] Petroleum has played a huge role in promoting economic development as the main vehicle fuel. However, with the economic development, the contradiction between the increase of energy demand and the continuous reduction of oil and its non-renewability has become increasingly prominent. At the same time, the environmental pollution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/32B01J23/83B01J23/10B01D53/94
CPCB01D2258/016B01J37/03B01D53/945B01J23/002B01J23/83B01D2255/2073Y02T10/22B01J35/002B01D2255/20746B01D2255/20753B01D2255/407B01D2255/20738B01J23/34B01D2255/20761B01J2523/00Y02T10/12B01J35/30B01J2523/3712B01J2523/48B01J2523/845B01J2523/847B01J2523/17B01J2523/842B01J2523/72
Inventor 沈美庆翁端王建强王军
Owner TIANJIN UNIV
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